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Logic Circuit to Enhance the Function of an Arithmetic Logic Unit

Publishing Venue

IBM

Related People

Kocis, TJ: AUTHOR

Abstract

Disclosed is a method to enhance the functionality of a common industry or VLSI macro Arithmetic Logic Unit (ALU) using simple external logic. Common industry and VLSI macro ALUs are designed with a specific set of functions. A designer may want to enhance this function set to increase the overall processor function or performance. This may be accomplished by inserting logic before the ALU as shown in the figure. In this way, the designer may conditionally modify the operation ALU dependent on the "New Carry In" or the "Conditional Inputs". For example, consider an ALU whose set of functions include both "Outputs = A Inputs" and "Outputs = the 2's complement of the A Inputs".

Country

United States

Language

English (United States)

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Logic Circuit to Enhance the Function of an Arithmetic Logic Unit

Disclosed is a method to enhance the functionality of a common industry or
VLSI macro Arithmetic Logic Unit (ALU) using simple external logic. Common
industry and VLSI macro ALUs are designed with a specific set of functions. A
designer may want to enhance this function set to increase the overall processor
function or performance. This may be accomplished by inserting logic before the
ALU as shown in the figure. In this way, the designer may conditionally modify
the operation ALU dependent on the "New Carry In" or the "Conditional Inputs".
For example, consider an ALU whose set of functions include both "Outputs = A
Inputs" and "Outputs = the 2's complement of the A Inputs". For a specific value
of "New Control Inputs", the designer wants the ALU to perform the function
"Outputs = A Inputs", if the most significant bit (msb) of the "A Inputs" is a logical
zero, or "Outputs = the 2's complement of the A Inputs" if the msb of the "A
Inputs" is a logical one. To accomplish this, the msb of the "A Inputs" becomes
the "Conditional Inputs". The Enhancement Logic is then designed to generate
the "ALU Carry in" and "ALU Control" inputs to perform the desired operation
based on the specific "New control Inputs" and the msb of the "A Inputs".